Kizu Manga by Otsuichi, Hiro Kiyohara

In Keigo's school, all the troubled kids are grouped into one class -- the troublemakers, the abused kids, and the scarred ones. There's a quiet kid in his class named Asato who never talks to anyone, and like Keigo, doesn't want to go home after school. One day after class Keigo cuts himself, and the two of them discover that Asato has the ability to absorb the wounds of others. What wounds will Asato heal, and what scars does he himself carry...?